Yes. It's the ratio of 605 to 1,000, or 121 to 200.
Any number that you can write completely on paper using digits,
and a decimal point or a fraction bar if you need them, is rational.
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It must be a generalised rational number. Otherwise, if you select a rational number to multiply, then you will only prove it for that number.
Yes. Any rational number divided by another rational number is also rational.